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@M_V
Pulled a bit of fluid out of my front 4pot XT today to open up pads a little bit and it was a pretty horrible looking grey/green/blue kinda colour so presumably not genuine Shimano fluid. Not as rich a blue as Magura blood looks in the bottle but I dunno how this degrades over time.
I'm thinking of replacing the hoses soon anyway so should I just go back to Shinano oil at that point or would there be any risk of a change in fluid fucking up the seals?
The inboard pistons on the front brake don't seem too lively, is popping these out and giving them a clean up an easy thing to do? Can I do this without replacing seals as I imagine they're going to be pretty hard to come by now? If I'm replacing pads and fluid etc anyway is it just a case of pumping the lever with the caliper off and pads out to eject the pistons?